Acid or sea-water resisting alloy



Patented Dec. 13, 1927.

THOMAS H. DIYEN, SR, 01 BALTIMORE, MARYLAND.

ACID OB SEA-WATER BESISTING ALLOY.

in Drawing.

My invention relates to articles exposed .to acids or sea water either water itself or the spray from the Water. Heretofore articles made principally of aluminum an .ex-

6 posed to acids or sea water would decompose and it has been difiicult to keep such articles clean or bright looking for any extended length of time. Fish bait, engine bases, and other castings on board Ships at 10 sea when made of aluminum, soon tarnish, and in the course of a comparatively short time, are practically ruined by action of the sea water on these exposed articles, yet because of its lightness and its a pearance, it

16 has long been desirable to use aluminum articles in fishin tackle and on board vessels at sea, and it is the object of my invention to so treat the aluminum as to render it practically non-tarnishable when exposed to 20 salt water or salt water spray. I have discovered that if these articles are cast from an alloy containing about 93.25% of aluminum, 5.25% of t1n, .75% of hosphorus, that the articles will resist the decomposing 26 action of the salt water or spray and will last in their presence for long periods of time without tarnishing.

I have found it also advantageous to incorporate .75% of magnesium into the alloy.

30 The alloy without the magnesium is highly eflicient to accomplish the foregoin objects,

but is somewhat improved by the dition of the magnesium.

.In carrying out my invention, I melt the v 86 comparatively pure aluminum in a commercial graphite crucible and add the tin and phosphorus to the melted aluminum and when desirable the magnesium is also added. The allo is allowed to cool in the ordinary (0' way or if it becomes necessary to roll the num.

Application fled March 25, 1927. Serial No. 178,499.

metal, the alloy is first poured into ingots of suitable size for rollin and afterward made into the desired artic es.

PATIENT OFFICE.

' The addition of the tin, phosphorus and magnesium to the aluminum does not lessen the toughness or malleability of the alumi-- ents of my article within the ordinary rangeof use where alloys of this character are involved, but I prefer approximately the above 7 roportions to at the best described results om the use 0 my article.

What I claim is: w

1. Articles having the appearance of aluminum and eat resistance against the action of acid, sa t water or ,salt water spray, said articles being made from an aluminum alloy containing approximately 5.25% tin, .75% of phosphorus and above 93% alumi- 2. Articles having the appearance of aluminum and great resistance against the action of acids or salg'tgjwater, said articles being made from an alloy of aluminum comprisin approximately 5.25% tin, .75% phosp orus, .75% magnesium, and the rest aluminum.

In testimony whereof I afiix m si THOMAS M. DI

ature.

roduced quite an unex- 

